The advertisement shows the cost of buying staplers from a stationery shop.
- Sabrina bought 26 staplers. How much did she pay?
- Eric bought 90 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 26 ÷ 15
= 1 r 11
Cost of first 15 staplers
= 15 x 4.10
= $61.50
Cost of the next 11 staplers
= 11 x 3.90
= $42.90
Amount that Sabrina paid
= 61.50 + 42.90
= $104.40
(b)
Number of staplers that was not part of the first 15 staplers
= 90 - 15
= 75
Cost of first 15 staplers = $61.50
Cost of the next 75 staplers
= 75 x 3.90
= $292.50
Total cost of 90 staplers before an additional discount of 7% is applied
= 61.50 + 292.50
= $354
Amount that Eric paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 90 staplers = 354
1% of the total cost of 90 staplers = 354 ÷ 100 = 3.54
93% of the total cost of 90 staplers = 93 x 3.54 = 329.22
Amount that Eric paid = $329.22
Answer(s): (a) $104.40; (b) $329.22